CONCENTRIC CABLE
NPC Electric Concentric Cable is designed with a central phase conductor surrounded by an evenly distributed concentric neutral conductor, providing a stable electrical return path and enhanced system safety. The concentric construction ensures uniform current distribution, reduces electromagnetic interference, and improves grounding reliability. High-purity copper or aluminum conductors are combined with durable insulation materials that offer excellent resistance to moisture, heat, and environmental stress. This cable structure is widely used in low-voltage power distribution, where mechanical protection and electrical stability are critical. The concentric neutral layer also enhances fault current handling and minimizes voltage drop during operation. With strong mechanical strength, long service life, and consistent electrical performance, concentric cables are suitable for underground installation and utility networks requiring dependable power delivery.
Construction
Technical Specifications
Quality Control
Application
Construction
Concentric Cable
Standard
ASTM B 8,ASTM B 3, ASTM 193,ASTM B 800, ASTM B 801,NEC Numeral 310, UL 44, UL 854, UL 1581
Conductor
Copper wire, Aluminum Wire, Aluminum Alloy Wire S8000
Insulation
XLPE or PVC or customized
Neutral Conductor
Copper wire, Aluminum Wire, Aluminum Alloy Wire S8000
Binder Tape
Polyester Tape or customized
Outer Sheath
XLPE or PVC or customized
Technical Specifications
CONCENTRIC CABLE
Circular Type Concentric Cables
Flat Type Concentric Cables
| Size | Phase Conductor | XLPE Insulation | Neutral Conductor | XLPE Sheath | Approx.Weight | |||||
| Structure | O.D | Thickness | O.D | Structure | O.D | Thickness | O.D | CU | AL | |
| AWG | No./mm | mm | mm | mm | No./mm | mm | mm | mm | kg/km | kg/km |
| 2x8 | 7/1.23 | 3.69 | 1.14 | 5.97 | 25/0.65 | 7.27 | 1.14 | 9.84 | 202 | 97 |
| 2x10 | 7/0.98 | 2.94 | 1.14 | 5.22 | 25/0.52 | 6.26 | 1.14 | 8.83 | 141 | 74 |
| Size | Phase Conductor | XLPE Insulation | Inner Sheath |
Neutral Conductor |
XLPE Sheath | Approx.Weight | ||||
| Structure | O.D | Thickness | O.D | Thickness | Structure | Thickness | O.D | CU | AL | |
| AWG | No./mm | mm | mm | mm | mm | No./mm | mm | mm | kg/km | kg/km |
| 3x8 | 7/1.23 | 3.69 | 1.14 | 5.97 | 0.7 | 65/0.41 | 1.14 | 16.59x10.62 | 396 | 227 |
| 3x6 | 7/1.55 | 4.65 | 1.14 | 6.93 | 0.7 | 65/0.52 | 1.14 | 18.73x11.80 | 551 | 297 |
| 3x4 | 7/1.96 | 4.98 | 1.14 | 8.16 | 0.7 | 65/0.65 | 1.52 | 22.21x14.05 | 830 | 427 |
| 3x2 | 7/2.47 | 7.41 | 1.14 | 9.69 | 0.7 | 65/0.83 | 1.52 | 25.63x15.94 | 1233 | 587 |
Quality Control
CONCENTRIC CABLE
Raw Material Test
Raw Material Test ensures all incoming materials meet strict quality requirements before manufacturing. Conductors are tested for purity, electrical conductivity, tensile strength, and dimensional accuracy. Insulation materials are evaluated for heat resistance, aging performance, mechanical strength, and uniformity. Only materials that pass chemical, physical, and electrical inspections are approved for production, ensuring consistent quality and stable electrical performance of the concentric cable.
Process inspection
Process Inspection monitors critical parameters throughout cable manufacturing. Conductor assembly is inspected for correct stranding and alignment, while insulation extrusion is checked for thickness consistency and concentricity. The formation of the concentric neutral conductor is carefully controlled to ensure uniform distribution and secure bonding. Ongoing inspections and in-process tests help maintain product reliability and prevent deviations from design specifications.
Finished Product
Finished Product Testing verifies the overall electrical, mechanical, and safety performance of the concentric cable. Tests include conductor resistance measurement, insulation resistance, voltage withstand testing, and continuity of the concentric neutral layer. Mechanical tests such as bending, tensile strength, and dimensional verification are also performed. Visual inspection confirms surface quality and marking accuracy. Only cables that fully comply with technical specifications and relevant standards are approved for delivery.
Application
Concentric cables are widely used in low-voltage underground power distribution, utility service connections, residential networks, and commercial electrical systems where reliable grounding and stable power transmission are required.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Wires and Cables packaging (1)
Wires and Cables packaging (2)
Wires and Cables packaging (3)
Wires and Cables packaging (4)
Wires and Cables packaging (5)
Wires and Cables packaging (6)
Wires and Cables packaging (7)
Wires and Cables packaging (8)
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What are the advantages of power cables and overhead lines?(1) Reliable operation, because it is installed in a hidden place such as underground, it is less damaged by external forces, has less chance of failure, and the power supply is safe, and it will not cause harm to people; (2) The maintenance workload is small and frequent inspections are not required; (3) No need to erect towers; (4) Help improve power factor.
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Which aspects should be considered when choosing the cross section of a power cable?(1) The long-term allowable working current of the cable; (2) Thermal stability once short circuited; (3) The voltage drop on the line cannot exceed the allowable working range.
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What are the measures for cable fire prevention?(1) Use flame-retardant cables; (2) Use fireproof cable tray; (3) Use fireproof paint; (4) Fire partition walls and fire baffles are installed at cable tunnels, mezzanine exits, etc.; (5) Overhead cables should avoid oil pipelines and explosion-proof doors, otherwise local pipes or heat insulation and fire prevention measures should be taken.
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What should be paid attention to during the transportation and handling of cables?(1) During transportation, loading and unloading, cables and cable reels should not be damaged. It is strictly forbidden to push the cable reels directly from the vehicle. Generally, cables should not be transported and stored flat. (2) Before transporting or rolling the cable reel, ensure that the cable reel is firm, the cable is wound tightly, the oil pipe between the oil-filled cable and the pressure oil tank should be fixed without damage, the pressure oil tank should be firm, and the pressure indication should meet the requirements.
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What inspections should be carried out for the acceptance of cable lines?(1) The cable specifications should meet the regulations, the arrangement should be neat, no damage, and the signs should be complete, correct and clear; (2) The fixed bending radius of the cable, the related distance and the wiring of the metal sheath of the single-core power cable should meet the requirements; (3) The cable terminal and the middle head should not leak oil, and the installation should be firm. The oil pressure of the oil-filled cable and the meter setting should meet the requirements; (4) Good grounding; (5) The color of the cable terminal is correct, and the metal parts such as the bracket are completely painted; (6) There should be no debris in the cable trench, tunnel, and bridge, and the cover should be complete.
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